My rooster is less than a year old ( we got him at the start of COVID ) and he was fine up until the last month or so. He suddenly became very lethargic, stands with his eyes closed , barely eats or drinks , very slow. His comb has gotten very pale. And he started breathing really hard. We weren’t sure he he had worms so we started treating him with dewormer but his conditions haven’t changed and none of my other chickens seem to be having issues ? Does anyone know what may be wrong or how I can help him ???